I don't believe hemostats are at all necessary for feeding live. Two reasons: some rats/mice actually squeak when you hold them by their tails, this may or may not disturb you. Second, even though you're using the hemostats so the snake doesn't eat any substrate accidentally, it will eventually pick up pieces of substrate when the rat/mouse isn't held by the hemostats, and you can't hold on to it while your BP is constricting. Moving them straight to a feeding bin, without handling should not confuse the snake between handling/feeding time. Make sure you don't smell like rodent when you handle it, though. If you wish, you can use a snake hook to take it out of the tank when feeding in a separate bin. Pre-scenting may or may not also be necessary if you plan on feeding live. The little buggers normally do the job for you if they're not frozen. All in all, seems like you've got your method pretty much sorted out, just don't give yourself extra work if it's unnecessary.